When we see records being broken and unprecedented events such as this, the onus is on those who deny any connection to climate change to prove their case. Global warming has fundamentally altered the background conditions that give rise to all weather. In the strictest sense, all weather is now connected to climate change. Kevin Trenberth

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Wednesday, April 3, 2013

"Independent confirmation of global land warming without the use of station temperatures†," by Gilbert P. Compo et al., GRL (2013); DOI: 10.1002/grl.50425

Geophysical Research Letters, (2013); DOI: 10.1002/grl.50425Independent confirmation of global land warming without the use of station temperatures

Gilbert P. Compo1,2,*,

Prashant D. Sardeshmukh1,2,

Jeffrey S. Whitaker2,

Philip Brohan3,

Philip D. Jones4,5, and

Chesley McColl1,2

Abstract

[1] Confidence in estimates of anthropogenic climate change is limited by known issues with air temperature observations from land stations. Station siting, instrument changes, changing observing practices, urban effects, land cover, land use variations, and statistical processing have all been hypothesized as affecting the trends presented by the Intergovernmental Panel on Climate Change and others. Any artifacts in the observed decadal and centennial variations associated with these issues could have important consequences for scientific understanding and climate policy. We use a completely different approach to investigate global land warming over the 20thcentury. We have ignored all air temperature observations and instead inferred them from observations of barometric pressure, sea surface temperature, and sea-ice concentration using a physically-based data assimilation system called the 20th century Reanalysis. This independent dataset reproduces both annual variations and centennial trends in the temperature datasets, demonstrating the robustness of previous conclusions regarding global warming.